There is conclusive evidence that e-cigarette use increases airborne concentrations of particulate matter and nicotine in indoor environments compared to the background level. Thus, harm to bystanders exposed to the exhaled aerosols might occur.  To minimize passive exposure to e-cigarettes aerosol, the WHO Tobacco Free Initiative provided policy suggestions for countries to regulate e-cigarettes including banning the use of e-cigarettes in places where smoking conventional cigarettes are already prohibited. In addition, Article 20 in European Union Tobacco Products Directive (EU TPD) 2014/40/EU regulates provisions on the safety and quality specifications for e-cigarettes which may also address the concern of their adverse health effects. However, little is known about the approach taken by European countries on specific regulations dedicated to protecting bystanders from exposure to secondhand aerosol (SHA) of e-cigarettes and whether their approaches adhere to WHO recommendation and/or EU TPD.